Grinding machine



June 2111927.

W. J. BAUMBERG ER GRINDING MACHINE Filed June 2a, 1923 2 Sheets-Sheet 1 line 21 1927.

w. J. BAUMBERGER GRINDING MACHINE Filed-June 28, 1923 2 Sheets-Sheet 2 l@- to w fl xria x Patented June 21, 1927.

uNiransrAres rarest orries.

WILLIAM J. BAUMBERGEB, OF DAVENPORT, IQWA, ASSIGNOR TO MICRO MACHINE COMPANY, OF BETTENDORF, IOW'A, A CORPORATION OF IOWA.

enrnnme MACHINE.

Application filed June 28, 1923. Serial No. 648,238.

The object of the invention is to provide a gear box assembly and control therefor adapted particularly for reciprocating a. work-carrying table on grinding machines and the like, wherein the driving means is quickly reversed, and wherein movement of the table will move said means to neutral position upon failure of parts of the revers ing mechanism especially a spring or springs employed for quickly completing the reversing movement, whereby injury to the work will beavoided. Briefly, the invention resides in a power driven reversing mechanism for reciprocating the table which includes a clutch member shifta-ble for reversing the movement of a train of gears, whereby the direction of movement of the work-carrying table or bed is reversed, said clutch member being shiftable by the table in its movements, the table engaging an arm which is slidingly connected 'ith the clutch member to provide a limited amount of lost motion between the arm and the member during initial movement of the arm, a spring being employed for quickly completing movement of the arm in either direction after the arm is moved slightly past dead center by the moving table, whereby the clutch member is quickly shifted.

Another feature of the invention consists in the provision of means whereby. if the spring breaks, movement of the table will continue the movement of the arm until the clutch member is drawn to neutral position, whereupon movement of the table will cease.

The invention also includes a second clutch, 1

preferably a friction clutch, set into the gear train,',the friction clutch being manually dis engageable, whereby a hand wheel or the like may be actuated for moving a portion of the gear train for rough adjustment of the table.- I

In the accompanying drawings, wherein one embodiment of the invention is disclosed by way of illustration, I V

Fig. 1 is a section on line 1-1 of Fig. 2 showing in side elevation the assembly within the gear box, portions of certain gears being broken away.

Fig. 2 is a top plan view of the mechanism shown in Fig. 1 with the cover removed,

viewed as indicated by the arrows '2 in Fig. l.

Fig. 31s a. vertical cross section taken on the line e 3 OfFig. 1.

Fig. 4 is a section taken approximately 011 the li1ie 4l-{t of Fig. 1 showing the mounting of the clutch shifting arm, the gearing in the casing being omitted.

Fig. 5 is a sectional detail showing the adjustable pin carried in the upper end of the clutch-shifting arm.

Fig. 6 is a diagrammatic side elevation showing the arrangement of the present gear :boX with relation to the parts of a grinding machine. Fig. 7 1S a sectional detail view showing the connection between the actuating arm operate upon a piece of'work supported in any suitable manner upon 'a work-carrier l8 secured to the table or bed 10.

For reversing the table actuating mechanism the table 10 is provided with spaced laterally projecting engaging studs or blocks 20 on one side thereof which are adjustable longitudinallyof the table and are adapted to engage a suitable controller arm for causing the shifting of the reversing Fclut-ch. lVIbunted on a horizontal pivot-21 at the bottom of the gear box B is an arm 22 which projects through the top of the gear box adjacent the side edge of the table 10. i The upper "end'of the arm 22 is between the two blocks 20 just outside the path of movement thereof, and carries at its upper end a horizontally disposed sleeve 23 in which is a slidably mounted pin 24 which is adapted to be adjusted to a position in which the inner end thereof is in the path of movement of the blocks, so that the arm 22 will be actuated by the blocks during reciprocation of the table 10.

The sleeve 23 proj ects outwardly from the arm 22 and has a threaded inner end which is screwed into an opening 1n the upper end of the arm 22. The pm 24 is held .111 adjusted position within the sleeve 23 by means of a bowed leaf spring 25 positioned within a longitudinal groove in the pin 24 and bearing against theinner surface of the "sleeve driven through a clutch 30 by means of which the shaft 30 may be connected to or disconnected from the source of power. warm the gear box B the power shaft30 has a clutch member 32 splined thereon,

which is shiftable into driving engagement 'with either of the two oppositely facing beveled. pinions 33 and 34 which are loose on the shaft 30, or is movable into neutral position, as shown in Fig. 2, by means of a yoke pivoted at 35 to the back wall of the gear box B, said yoke 35 being operable from the arm 22 by means of a connecting V linkor rod 36. a a

The connecting rod 36 is supported in horizontal position for longitudinal. sliding movement directly over the shaft 30 in a bearin blockv 36 carried upon the top of the end bearing of the shaft 30. The connecting rod 36 has a longitudinally extending slot 36 'at its forward end which receives a vertical pin 36-carried by the. outer end of the yoke 35, the movement of the pin 36 in the slot being limited by .stoprmembers 36 which are detachably and slidably mounted at opposite ends of the slot, the stop members 36being adjustable to vary the amount of lostmotion between the rod 36 and yoke 35 by means of adjusting screws 36 which serve to properly position the stop members 36 with respect to the yoke 35 as well as to vary the length of the slot. At its rear end the rod 36 has an enlargement 36, which has a flat outer face in which there is a vertical groove 36 into which extends a pin 2 37 carried by the outer end of a forwardly extending portion 37 of the arm 22. The pin and groove connection between the rod 36 and arm 22 provides the necessary relative movement to permit the rod 36 to be shifted back and forth by the arm.

In Fig. 7 the gears 33 and 34 may have sleeves thereon foryieldingly engaging with the iaw clutch member 32 so that theclutch teeth of the member 32, if not in proper alinement with the motches in the clutch member of the gear at the instant of engagement, Wlll snap into engagement as soon as the shaft rotates sufficiently to allne the teeth with the notches. a

An important feature of the present invention consists in the provision of a spring actuator operable to move the clutch mem' bers into engagement and so connected to the clutch shlfting mechanism that 111 the event the spring actuator becomes ineffective the clutch element controlling the actuation of the table will always be stopped in neutral position. To accomplish this result, an actuating spring 40 is so connected to the arm 22 that immediately after movement of the arm in either direction fromne utral position'by one of the blocks 20 on the table,

the spring 40 will act upon the varm 22 to continue the movement of the arm at a more rapid Irate and snap the clutchelement 32 into engagement with the gear towardwhich it is moving, Thespiral spring 40 is connected at its lower end Witha vertically disposed eye bolt 41 connected to thebottom of the gear box B in front of the arm 22 and in vertical alinement with thepivot 21 of the arm. The upper endjof the spring 40 is connected to an eccentric'pin42 on a disk 43 fixed. to the outer end of a shaft 44 which is journaled in a bearingboss 44. on the rear wall of the gear box behind the lever 22. The shaft 44 extends through an elongated transverse slot in the arm 22 and has a pinion 45. fixed thereon which meshes with rack teeth 46 formed in the lower edge of the slot. a

When the arm 22, is in vertical position the clutch element 32 isin neutral position and the pin 42 is positioned directly over,

the shaft .44 so that the pin 42 is at dead center and the spring exerts no turning force on the disk. However, upon movement of the arm in either direction from vertical position, the disk 42 will be rotated in the direction of movement of the arm through the pinion 45 and rack 46 and. the pin 42 will be shifted ofi' center, whereupon the spring 40 will act upon the disk 43 to rapidly turn the shaft 44 and shiftthe arm22 throughthe pinion 45 and rack 46 to engage the clutcheement 32 with the gear toward which it is moving. The clutch element 32 will normally 7 be in engagement with one of the gears .33 or 34 so that when the clutch 31 is thrown in the table will be shifted. As the table isshifted, one of the abutments 20 will engage the pin 24 and shift the arm in a direction to disengage the clutch, the sot 36* permitting. the

. arm to move slightly past neutral position before the clutch is disengaged. As the arm 22 is moved past neutral position, the spring 40 becomes effective and snaps the clutch member 32 into engagementwith the opposite gear, reversing the direction of move.-

Lil

inent ofthe table, whereupon the operation above described is repeated when the table has moved far enough to bring the other abutment'20 into engagement with the pin 24.

However, if spring 40 should be broken or has become too weak so that quick movement of the arm 22 thereby cannot be made to shiftthe clutch 32 from one pinion to the other, continued movement of the table 10 will gradually move the arm 22 to cause link 36 to move ciutch32 into neutral position as shown in the drawings whereupon the table will stop.

In order to close the top of the gearbox B a plate 48 is provided which slides in guides 49 with the movements of thearm 22 which projects through said plate 48.

The pinions 33 and 34- engage with a bevel gear 50 which is driven thereby in opposite of a cone clutch 58 keyed on said sleeve 56 and movable to and from engagement with an inner clutch face'of gear 55. Sleeve 56 has a pinion 59 fixed thereon which drives gear 60 through the medium of an idler 61, the gear 60 beingfixed on a shaft 62which carries a gear 64 inengagement with a rack 65 on the table 10 for reciprocating the latter. Thus power from the shaft 30 is trans mitted to the table 10 to move the same in opposite directions, the direction of drive being reversed by actuation of arm 22 to shift clutch 32 into and from engagement with the pinions 33 and 34 as above described.

In order that the table 10 may be rotated by hand, as for purposes of rough adjust ment or the like, a hand wheel fixed'tov the shaft 57 and a hand wheel 72 threaded on the outer end of sleeve 56 are provided. Wheel 72 engages'the inner face ofthe hub of wheel 70 and the outer face of the bearing for gear 55, so that turning of. wheel 72 to cause it to move outwardly on sleeve .56

causes the sleeve and cone clutch 58 to be moved inwardly to disengage clutch 58from gear 55, the inner end of sleeve '56 having sufficientplay at 56 for this purpose.

Hand wheel 70 is then free to be rotated for turning the shaft 57 and a pinion 74 fixed thereon; pinion 74 drives idlers 75 and 76 and idler 7 6 also meshes with the gear 60 for driving the table 10 through the medium of hand wheel 70. WVhen the table has been moved as desired, hand wheel 72 is then returned to cause cone clutch 58 to engage gear 55, so that the table may be automatically reciprocated as herein above described when clutches 30 and 32 are engaged. A removable plate'80 may be provided for easy acclaims;

cess to spring 40 without disturbing the cover on the gear box B.

Thus, a gear assembly is provided whereby the table 10 may be actuated either by power or by hand, and whereby-the moving on failure of the spring 4E0fduring, power drive thereby avoiding ll possibility of danger. to the work on the table.

Furthermore, it is to be understood that the particular forms of apparatus shown and described, and the particular procedure set forth, are presented for purposes of explanation and'illustration and that various modifications ofsaid apparatus and procedure can be made without departing from my invention as defined in the appended WVhat I claim 'is: 1. In combination, areciprocable table, a gear drive therefor, a clutch for said gear drive movable to positions for'driving the table in opposite directions, a shiftable member having a lost motion connection with said clutch, a rack for actuating said mem ber, a pinion foractuating the rack, said pinion having a relatively"stationary axis and means connected with the pinion for causing a quick movement thereof in each direction beyond a dead center position, 'said shiftable member being actuable in both difrecti'ons by said'table to cause movement of ber, a pinion for actuatirigthe rack, said pinion havin'ga relatively stationary axis,

and spring means eccentrically connected 70 parts will be placed in neutral position upwith the pinion for causing movementthereer ineach direction beyond a dead center position, said shiftable member being actuable in both directions by said table to cause movement of said pinion to a position of dead center. I

3. In combination, therefor movable to positions for driving different gears. a movable arm connected. with said clutch for shifting theclutch, a

rack on said arm, apinion in engagement with said rack, said pinion having a rela' tively stationary axis, and a spring eccentrically connected with saidpinion for quick movement of the arm beyond dead center. I

4. In combination, a'reciprocable table, a gear drive therefor, a clutch for said gear. drive movable to positions for driving in opposite directions, a slidable member having a lost motion connection with said clutch,

a rack operatively connected to said member, a pinlon for actuating sald rack, said a gear drive, a clutch pinion having a relatively stationar axis with thereof beyond dead center, said, slidable member being actuable in both directions by said table tocause movement of sa d pmionqto a positionof dead center. i i

5. In combination, a gear drive, aclutch therefor movable to positions; for driving in oppositedirections, aswinging arm, having a-lost-motion connection with said clutch g for movement of the arm to dead center without shifting the clutch, a rack on said arm, a pinion having awrelatively stationaryvaxis engaging saidrack, a'COI1I16Gt10H eccentric-ally connected with said pinion to be at deadcenter when said arm is at dead center, and a spring engaging said connection' to produce quick movement of the arm beyond-dead center for quick'movement of the clutch. "I i i i 6. In combination, a gear drive, a clutch therefor movable to neutral position and to :positions for drivirigin opposite directions, -apivoted arm having lost motion connec- Jtion with the clutch for initial movement of the arm to dead center withoutmovement of the clutch, a spring to complete movement of the arm beyond dead center for movement of the clutch, and a rack and pinionconnection between said spring and arm, the attachment of the spring being eccentric and being adapted to beat dead center when the arm is at dead center.

7. In combination, a, gear drive, a clutch therefor movableto neutral position and to positions for driving in opposite directions,

a pivotedarm having lost motion connection with the clutch for, initialimovcment of the arm to dead centerwithout movement, of the clutch, a spring to] complete movement of the arm beyond dead, center for movement of the clutch, and rackand in'ion connec-.

spring in orderto shift the clutch to neutral e e I i .ated dev ce engagmg said sleeve for shifting said clutch through themedium of said neutral position and to positions fordriving in opposite directions, a pivoted arm having a lost motion connection with the clutch for initial movement of the arm bythe table without movement of the clutch, a spring to complete movement of the arm beyond tion. a W 9. The combination witha reciprocable table, of means to drive the same compr1s- 111g a drlve gear, a sleeve about WhlCh, said wea es) form one driving positontothe other, an'd a rack and pinion connection between said arm and spring for quick movement of the clutch, the attachment of the spring. to the rack and pinion connection being eccentric and being adapted to be at dead center when saidarm is at dead center, the arm beingmovable beyond dead center by move,-

ment of the table upon failure of the spring in order to shift the clutch to neutral posigear rotates, a clutchmember fixed to retate with the sleeve and movable to and from driving engagement with said gear, gearing driven by said sleeve to actuate said table, a shaft rotatable within the sleeve,

hand operable means to rotatethe shaft, a

pinion on said shaft, gearing operable by. said 1pinion toactuate said table when said clutc is released from the drive gear, and

means for movin said clutch into and out e of engagement with a said gear.

10.'In combination, a' drive member, a

[sleeve about which said member rotates,'a clutch fixed to rotatefwith the sleeve and,

movable to and from driving engagement, with said member, driven means actuated 1 from said sleeve, a shaft rotatable within the sleeve, hand operable means to rotate the shaft, means on the shaft. to drive said driven means when said clutch 'isfreleased p from said drive member, and, a hand pee ated device engaging said sleeve for shifting said clutch through the medium of said sleeve. i i

11. In combination, a drivemembei, a1

sleeve about which said member rotates, a clutch fixed to. rotate with the sleeve and movable to and from driving engagement 'withflsaid member, driven means actuated from said sleeve, a shaft rotatable within a the sleeve, hand operable means to rotate the shaft, means on theshaft to drive said driven means when said clutch is released from said drive member, and a hand opersleeve, the hand operated device for the sleeve being disposed between the, drive member and thehand operable means for the shaft. a g i i In testimony whereof,"I hereunto aflix my 

